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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2-(1/x) = 0
x^2-x^-1 = 0
1*x^2-1*x^-1 = 0
(1*x^3-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^3-1*x^0) = 0
x^1
x^3-1 = 0
{ 1, -1 }
1
x = 1
x^3-1 = 0
1
x-1
x^2+x+1
x^3-1
x-1
x^2-x^3
x^2-1
x-x^2
x-1
1-x
0
x^2+x+1 = 0
DELTA = 1^2-(1*1*4)
DELTA = -3
DELTA < 0
x in { 1}
x = 1
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